I am about ready to change out the coolant in my '03 HO Quad Cab. I plan on using Zerex G-05 antifreeze as this is HOAT formula which is DC approved. I will cut 50/50 with distilled water. Do I need to add a bottle or two of the Fleetguard DCA60L to the new coolant? Is it necessary to remove both drain plugs, 5 mm hex socket plug, one on each side of the block or is removing one sufficient to drain the whole block. The one on the driver's side is a wooly booger bear to access. Any recommendations would be greatly appreciated.

L8r,.....dogger

 

At 100k, I changed mine. I didn't pull either block plug. I drained the radiator, refilled, flushed (hot), drained, refilled, flushed (hot), drained and repeated till clean water came out. Drained and filled with proper amount of coolant. That was 33k ago.

 

i drained and refilled at 70,000 miles. it took two gallons of zerex go-5 and two gallons of distilled water.